It is not hard to find a green building in New York City. The city boasts more than 519 million square feet of green building space and ranks number one among US cities in energy-efficient LEED certification.

A moment of silence at 8:46 a.m. Wednesday marked when the first plane hit the twin towers on a clear, sunny day in 2001. Then, families of the victims started reading aloud the names of those who died.